如何从std :: vector自动删除已完成的期货 [英] How can completed futures be automatically erased from std::vector

问题描述

在下面的示例中，mEventExecutors是 std :: vector< std :: future< void>> 。我希望能够在完成交易后从向量中删除其期货。

In the following exampl, mEventExecutors is a std::vector<std::future<void>>. I would like to be able to remove the futures from the vector, as they complete. Can this be done?

void RaiseEvent(EventID messageID)
{
    mEventExecutors.push_back(std::move(std::async([=]{
            auto eventObject = mEventListeners.find(messageID);
            if (eventObject != mEventListeners.end())
            {
                for (auto listener : eventObject->second)
                {
                    listener();
                }
            }
        })
    ));
}

推荐答案

不要使用<$我认为c $ c> std :: async 是简单的解决方案，请改用 std :: thread 。

Don't use std::async is the easy solution in my opinion, and use std::thread instead.

不过，您需要注意，您的代码当前有很多数据争用。考虑使用其他互斥锁或其他某种技术来防止它们。

You need to be careful though, your code currently has a lot of data races. Consider using another mutex or some other technique to prevent them.

std::thread{[=]() {
    // Task is running...
    auto eventObject = mEventListeners.find(messageID);
    if (eventObject != mEventListeners.end())
    {
        for (auto listener : eventObject->second)
        {
            listener();
        }
    }
}.detach(); // detach thread so that it continues

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